A split-flow guide for groundwater sampling that can accurately adjust flow rate

Abstract

The present invention relates to a flow diversion guide device for groundwater sampling that can accurately adjust the flow rate, which includes a pipe body, a sampling port arranged above the pipe body and a sample outlet arranged below the pipe body, a counterweight block is arranged at the lower end of the pipe body, and a sample outlet valve and a flow diversion assembly are arranged at the sample outlet; the sample outlet valve includes a valve cylinder, a sample outlet tube for sample outlet and a valve plate for closing the sample outlet tube, the sample outlet tube runs through the valve cylinder, the valve plate is slidably arranged along the axial direction of the sample outlet tube, a guide sleeve is arranged on the valve plate, the outer wall of the guide sleeve is fitted with the inner wall of the sample outlet tube, and a plurality of liquid outlet holes are opened on the circumferential side wall of the guide sleeve; the flow diversion assembly includes a drainage pipe, a diversion main pipe and a plurality of diversion branches; a sealing rubber sleeve is arranged in the sample outlet tube, the outer wall of the drainage pipe abuts with the inner wall of the sealing rubber sleeve, and the drainage pipe abuts with one end of the guide sleeve away from the valve plate. The present invention has the effect of facilitating the adjustment of the flow rate and conveniently transferring liquid to multiple containers at the same time.

Description

Technical Field

[0001] The present invention relates to the technical field of sampling tubes, and in particular to a split-flow guider used for groundwater sampling and capable of accurately adjusting flow velocity. Background Art

[0002] At present, a Chinese utility model patent with announcement number CN209012459U has announced an improved structure of a bele tube valve body, which is composed of a bele tube, a weight and a valve seat; it mainly includes a valve seat, a valve body and a valve plate, one end of the valve seat extends and fits on the fitting part of the bele tube, and the other end extends a drain pipe, the valve body has a through hole, a side plate extends from the surface, the side plate is provided with a snap-fit ​​groove, a snap-fit ​​part extends from one side of the valve plate, the snap-fit ​​part of the valve plate is connected to the snap-fit ​​groove in the side plate, the valve body is sleeved in the valve seat, the snap-fit ​​part of the valve plate can be rotated in the snap-fit ​​groove in the side plate, so that the valve plate can open and close the perforation of the valve body, thereby connecting to a valve seat of a preset bele tube, and the valve plate rotates at the snap-fit ​​part to achieve the opening and closing of the perforation of the valve body, so that the drain pipe of the valve seat is connected to or closed with the inside of the preset bele tube.

[0003] The existing baile valve body makes it convenient to take water, but has the disadvantages of being unable to accurately control the flow rate when taking out samples, and can only transfer liquid to one container at a time, which is difficult to meet actual work needs. Summary of the invention

[0004] In view of the shortcomings of the prior art, one of the objectives of the present invention is to provide a sampling tube that is easy to adjust the flow rate and convenient for transferring liquid to multiple containers at the same time.

[0005] The above-mentioned invention object of the present invention is achieved through the following technical scheme: a flow diversion guide device used for groundwater sampling and capable of accurately adjusting the flow rate, comprising a pipe body, a sampling port arranged above the pipe body and a sample outlet arranged below the pipe body, wherein a counterweight block is arranged near the lower end of the pipe body, and the feature is that a sample outlet valve and a flow diversion assembly are arranged at the sample outlet;

[0006] The sample outlet valve comprises a valve cylinder body detachably connected to the tube body, a sample outlet tube for outlet of samples and an opening and closing member for closing the sample outlet tube, wherein the sample outlet tube is arranged through the valve cylinder body;

[0007] The flow splitting assembly comprises a drainage tube connected to the sample outlet tube, a flow splitting main tube connected to the drainage tube, and a plurality of flow splitting branches connected to the flow splitting main tube;

[0008] A sealing rubber sleeve is arranged in the sample outlet tube, and the outer wall of the drainage tube abuts against the inner wall of the sealing rubber sleeve.

[0009] By adopting the above technical solution, the tube body is used to hold liquid samples, the sampling port is used for the liquid samples to flow into the tube body, the sample outlet is used for the liquid samples to flow out, and the counterweight enables the tube body to sink into the water; the valve cylinder is used to connect with the tube body, and the valve cylinder and the tube body are detachably connected, so that it is easy to disassemble and assemble the sample outlet valve and the tube body; the drainage tube is used to guide the liquid sample to flow into the shunt main pipe, and then further flow into multiple shunt branches, and multiple shunt branches can guide the liquid sample to other containers. The sealing rubber sleeve abuts against the outer wall of the drainage tube, which can better block the gap between the drainage tube and the sample outlet tube to avoid liquid leakage. The opening and closing part is used to close the sample outlet tube, so as to prevent water from leaking out of the tube body.

[0010] In a preferred example, the present invention can be further configured as follows: the opening and closing member is a valve plate, the valve plate is slidably arranged along the axial direction of the sample outlet tube, a guide sleeve is provided on the valve plate, the outer wall of the guide sleeve is fitted with the inner wall of the sample outlet tube, a plurality of liquid outlet holes are provided on the circumferential side wall of the guide sleeve, and the drainage tube is in contact with one end of the guide sleeve away from the valve plate.

[0011] By adopting the above technical scheme, the valve plate is used to close the sample outlet tube, the guide sleeve is used to guide the sliding of the valve plate, and the liquid outlet through hole on the guide sleeve is used for liquid output; the guide sleeve slides along the axial direction of the sample outlet tube, and when the liquid outlet through hole is connected with the tube body, the liquid can be output from the tube body along the sample outlet tube, and the different sizes of the liquid outlet through hole connected with the tube body make the flow rate of the liquid different, so that it can be conveniently adjusted; and the drainage tube abuts against the guide sleeve, so that the deeper the drainage tube is inserted, the more the liquid outlet through hole on the guide sleeve can be connected with the inside of the tube body, so that by changing the insertion depth of the drainage tube, the flow rate of the liquid sample output can be conveniently adjusted.

[0012] In a preferred example, the present invention can be further configured as follows: a connecting hose is provided between the drainage pipe and the diversion main pipe, and a speed regulating valve is provided on the connecting hose.

[0013] By adopting the above technical solution, the connecting hose is used to connect the drainage tube and the branch main tube. Due to the softness of the connecting hose, the branch branch tube can be more conveniently placed in other containers. The speed regulating valve is used to adjust the flow rate of the liquid sample to better control the outflow rate of the liquid.

[0014] In a preferred example, the present invention can be further configured as follows: at least two guide rings are provided in the valve cylinder, the axis of the guide ring is arranged parallel to the axis of the valve cylinder, and the guide ring is fixedly connected to the valve cylinder; a guide column slidingly matched with the guide ring is provided on the valve plate, and a return spring is sleeved on the guide column; one end of the return spring is connected to the guide ring, and the end of the return spring away from the guide ring is connected to the guide column.

[0015] By adopting the above technical solution, the guide ring is used to guide the sliding of the guide column, and the return spring is used to drive the valve plate to move or have a tendency to move toward the sample outlet tube; so that when there is no external force driving the valve plate to move, the valve plate can stably seal the sample outlet tube.

[0016] In a preferred example, the present invention can be further configured as follows: the speed regulating valve includes a mounting housing, the mounting housing is provided with a pipe passage for the connecting hose to pass through, the mounting housing is provided with a rolling groove, the length direction of the rolling groove is inclined relative to the length direction of the pipe passage; a rolling shaft is rollingly provided in the rolling groove, a rolling wheel is provided on the rolling shaft, and the circumferential surface of the rolling wheel abuts against the connecting hose;

[0017] The mounting housing is provided with an indicating scale.

[0018] By adopting the above technical solution, the tube passage is used for the connecting hose to pass through, and the rolling groove is used to guide the rolling axis to roll along the length direction of the rolling groove, so that the rolling wheel can roll along the direction of the rolling groove; so that the distance between the rolling wheel and the hose can be easily adjusted, thereby changing the degree of squeezing of the hose by the rolling wheel, and then the flow rate of the liquid in the hose can be easily changed; the indicating scale can clearly and more intuitively indicate the position of the rolling wheel in the rolling groove, so that the user can more intuitively adjust the flow rate of the liquid.

[0019] In a preferred example, the present invention can be further configured as follows: a guide cone is provided at one end of the sample outlet tube away from the drainage tube, the opening and closing member is an opening and closing valve ball, and an anti-drop rod is welded at one end of the guide cone away from the sample outlet tube; an abutment rod is provided at one end of the drainage tube extending into the sample outlet tube, and the abutment rod is arranged along the radial direction of the drainage tube.

[0020] By adopting the above technical scheme, the guide cone is used to accommodate the opening and closing valve ball, and the anti-drop rod is used to prevent the opening and closing valve ball from falling out of the guide cone hole; the abutment rod is used to abut against the opening and closing valve ball, so as to prevent the opening and closing valve ball from extending the drainage tube into one end of the sample outlet tube and blocking it, thereby ensuring that after the sample outlet tube lifts the opening and closing valve ball, the sample outlet tube can ensure that the liquid can flow out stably.

[0021] In a preferred example, the present invention can be further configured as follows: a shut-off valve is provided on the connecting hose, the shut-off valve includes a valve housing, the connecting hose passes through the valve housing, a shut-off plate is provided in the valve housing and is slidably arranged along the radial direction of the connecting hose, a shut-off spring is provided between the shut-off plate and the inner wall of the valve housing, the shut-off spring pushes the shut-off plate to slide in the direction of the connecting hose; a pressing plate extending out of the valve housing is connected to the shut-off plate.

[0022] By adopting the above technical solution, the cut-off valve is used to cut off the connecting hose, the cut-off spring pushes the cut-off plate to move toward the connecting hose, and the cut-off plate and the valve housing can squeeze the connecting hose, thereby better cutting off the connecting hose.

[0023] In a preferred example, the present invention can be further configured as follows: the diversion main pipe is provided with an adjusting piston which is slidably arranged along the length direction of the diversion main pipe.

[0024] By adopting the above technical solution, the piston is adjusted to slide along the axial direction of the shunt main pipe, which can better change the length of the liquid that can flow into the shunt main pipe, thereby changing the number of shunt branches connected to the drainage pipe, and then conveniently adjusting the number of shunt branches that can eventually flow out the liquid sample.

[0025] In a preferred example, the present invention can be further configured as follows: a filter installation cylinder is provided at the sampling port, the filter installation cylinder is detachably connected to the tube body, and a filter is provided in the filter installation cylinder.

[0026] By adopting the above technical solution, the filter installation cylinder is used to connect with the tube body, so that the filter installation cylinder can be easily disassembled and installed. The filter is used to perform preliminary filtration on the fluid sample to prevent debris from entering the tube body and causing blockage to the tank body, sample outlet valve or diversion branch pipe.

[0027] In a preferred example, the present invention can be further configured as follows: the filter installation cylinder extends outwardly with a limiting wing plate.

[0028] By adopting the above technical solution, the limiting wing plate can better limit the depth of the filter installation cylinder extending into the tube body, and the limiting wing plate can be conveniently held by the user to remove the filter installation cylinder, making it more convenient to replace the filter installation cylinder.

[0029] In summary, the present invention includes at least one of the following beneficial technical effects:

[0030] 1. The sample outlet valve is used to prevent the liquid in the tube from leaking from the outlet. The drainage tube is inserted into the sample outlet tube and pushes the guide sleeve to slide, which can better change the communication volume between the liquid outlet hole and the inside of the tube body, so as to change the outflow speed of the liquid sample;

[0031] 2. The flow splitting component is used to split the fluid sample in the tube body into multiple streams, and the flow splitting branch pipe is used to guide the multiple streams of fluid to flow out so as to simultaneously split the liquid sample into multiple different containers. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 It is a schematic diagram of the overall structure of Example 1;

[0033] Figure 2 This is a view of the connection structure between the connecting rope and the tube body at the sample outlet of Example 1;

[0034] Figure 3 is a schematic diagram of the sample outlet valve of Example 1;

[0035] Figure 4 is a schematic diagram of the disassembled state of the sample outlet valve in Example 1;

[0036] Figure 5 is a schematic diagram of the speed regulating valve of Example 1;

[0037] Figure 6 is a full cross-sectional view of the sample outlet valve and the cut-off valve of Example 2;

[0038] Figure 7 yes Figure 6 A magnified schematic diagram of part A;

[0039] Figure 8 yes Figure 6 A magnified schematic diagram of part B;

[0040] Fig. 9 is a schematic diagram of the branch pipe of Example 2;

[0041] Fig.10 yes Fig. 9 Enlarged view of part C Figure 1

[0042] In the figure, 1, pipe body; 4, sample valve; 5, flow distribution component; 6, valve cylinder; 7, sample pipe; 8, valve plate; 9, guide sleeve; 10, liquid outlet hole; 11, drainage pipe; 12, flow distribution main pipe; 13, flow distribution branch pipe; 14, sealing rubber sleeve; 16, connecting hose; 17, speed regulating valve; 18, guide ring; 19, connecting rod; 20, guide column; 21, mounting shell; 22, rolling groove; 23, rolling shaft; 24, rolling wheel; 25, friction pattern; 26, ruler; 27, guiding slope; 28, Adjusting piston; 29, filter installation cylinder; 30, limit wing plate; 31, counterweight; 32, connecting rope; 33, supporting ring; 34, connecting ring; 35, filter; 36, reset spring; 38, indicator scale; 39, guiding cone; 40, opening and closing valve ball; 41, anti-drop rod; 42, abutment rod; 43, shut-off valve; 44, valve housing; 45, shut-off plate; 46, shut-off spring; 47, pressing plate; 48, snap-on assembly; 49, connecting strip; 50, snap-on groove; 51, snap-on strip; 52, filter. DETAILED DESCRIPTION

[0043] The present invention is further described in detail below in conjunction with the accompanying drawings.

[0044] Embodiment 1:

[0045] Reference Figure 1 and Figure 2, is a flow diversion guide device for groundwater sampling and accurate flow rate adjustment disclosed by the present invention, comprising a pipe body 1, a sampling port and a sample outlet, the sampling port and the sample outlet are respectively arranged at the two ends of the pipe body 1, the sampling port is arranged at the upper end of the pipe body 1, and the sample outlet is arranged at the lower end of the pipe body 1; the pipe body 1 is made of transparent plastic material, the upper end of the pipe body 1 is integrally formed with two connecting rings 34, the two connecting rings 34 are symmetrically arranged on both sides of the pipe body 1, and connecting ropes 32 are tied to the two connecting rings 34. A counterweight 31 is coated on the outer wall of the pipe body 1 near the lower end, and a supporting ring 33 for supporting the counterweight 31 is arranged on the outer wall of the pipe body 1, the supporting ring 33 is integrally formed with the pipe body 1, and the counterweight 31 is made of stainless steel.

[0046] Reference Figure 1 A filter screen installation cylinder 29 is snap-fitted at the sampling port of the tube body 1. Two limiting wing plates 30 extend outward from one end of the filter screen installation cylinder 29 away from the tube body 1. The limiting wing plates 30 are semi-elliptical. The user can easily remove the filter screen installation cylinder 29 from the tube body 1 through the limiting wing plates 30; a filter screen 35 is fixedly connected to the bottom of the filter screen installation cylinder 29. The filter screen 35 can filter the liquid sample entering the tube body 1 to prevent debris from clogging the tube body 1.

[0047] Reference Figure 3 and Figure 4 The tube body 1 is provided with a sample outlet valve 4 at the sample outlet, and the sample outlet valve 4 includes a valve cylinder 6, a sample outlet tube 7 and a valve plate 8; the valve cylinder 6 is clamped and arranged at the sample outlet of the tube body 1, and the sample outlet tube 7 is arranged through the bottom of the valve cylinder 6, and the sample outlet tube 7 is coaxially arranged with the valve cylinder 6. The sample outlet tube 7 is welded and connected with the valve cylinder 6, and the liquid sample in the tube body 1 can flow out from the sample outlet tube 7; the valve plate 8 is covered on the end surface of one end of the sample outlet tube 7 located in the valve cylinder 6, and the valve plate 8 is integrally formed on the side facing the sample outlet tube 7. The guide sleeve 9 is inserted into the sample outlet tube 7, and the outer wall of the guide sleeve 9 is arranged in contact with the inner wall of the sample outlet tube 7; a plurality of liquid outlet holes 10 are opened on the circumferential side wall of the guide sleeve 9, and the plurality of liquid outlet holes 10 are arranged in three rows along the axial direction of the guide sleeve and six are evenly arranged around the circumferential direction; the guide sleeve 9 can slide along the axial direction of the sample outlet tube 7, and when the liquid outlet hole 10 is connected with the tube body 1, the liquid sample flows into the sample outlet tube 7 from the liquid outlet hole 10.

[0048] Reference Figure 4A guide ring 18 is integrally formed on the sample outlet tube 7, and the guide rings 18 are symmetrically arranged on both sides of the sample outlet tube 7. A guide column 20 is integrally formed on the valve plate 8, and the guide column 20 penetrates the guide ring 18. A reset spring 36 is sleeved on the guide column 20, and one end of the reset spring 36 abuts against the guide ring 18, and the end of the reset spring 36 away from the guide ring 18 is hooked on the guide column 20; the reset spring 36 can drive the valve plate 8 to cover the sample outlet tube 7, or make the valve plate 8 have a tendency to cover the sample outlet tube 7, so that when there is no external force to push the guide sleeve 9 to slide, the valve plate 8 can stably close the sample outlet tube 7.

[0049] Reference Figure 4 and Figure 5 The end of the sample outlet tube 7 away from the tube body 1 is provided with a shunt assembly 5, which includes a drainage tube 11, a shunt main pipe 12 connected to the drainage tube 11, and a plurality of shunt branches 13 connected to the shunt main pipe 12; the drainage tube 11 is connected to the sample outlet tube 7, and a sealing rubber sleeve 14 is snap-fitted in the sample outlet tube 7. The outer wall of the drainage tube 11 is fitted with the sealing rubber sleeve 14, and the end of the drainage tube 11 away from the shunt main pipe 12 is in contact with the guide sleeve 9, and the outer wall of the drainage tube 11 is provided with a sealing rubber sleeve 14. There is a scale 26, and the length direction of the scale 26 is set along the length direction of the drainage tube 11; after the drainage tube 11 is inserted into the sample outlet tube 7, the drainage tube 11 can push the guide sleeve 9 to slide, so that the liquid outlet hole 10 can be connected with the tube body 1; the user can clearly know the depth of the drainage tube 11 inserted into the sample outlet tube 7 according to the scale 26 on the drainage tube 11, and thus know the degree of connection between the liquid outlet hole 10 and the tube body 1, so as to control the circulation speed of the liquid sample.

[0050] Reference Figure 5 The drainage tube 11 is connected with a connecting hose 16, which is sleeved on the end of the drainage tube 11 away from the sample outlet tube 7, and the end of the connecting hose 16 away from the drainage tube 11 is connected with the diversion main pipe 12, and a speed regulating valve 17 is provided on the connecting hose 16; the speed regulating valve 17 includes a mounting shell 21 and a pipe-through passage arranged on the mounting shell 21, and the pipe-through passage is for the connecting hose 16 to pass through; rolling grooves 22 are provided on both sides of the inner side wall of the mounting shell 21, and the length direction of the rolling groove 22 is inclined relative to the length direction of the pipe-through passage; a rolling shaft 23 is rollingly arranged in the rolling groove 22, and a rolling wheel 24 is transitionally matched on the rolling shaft 23, and a friction pattern 25 is integrally formed on the outer circumferential surface of the rolling wheel 24, and the circumferential surface of the rolling wheel 24 is always in contact with the connecting hose 16; an indicating scale 38 is provided on the mounting shell 21, and the indicating scale 38 is arranged in three rows.

[0051] Reference Figure 5A guiding slope 27 is provided at one end of the shunt branch pipe 13 away from the shunt main pipe 12, and an adjusting piston 28 is slidably provided in the shunt main pipe 12 along its length direction, and a piston push rod is connected to the adjusting piston 28; four shunt branch pipes 13 are evenly provided along the length direction of the shunt main pipe 12, and the drainage pipe 11 is provided in the middle position of the shunt main pipe 12; sliding the adjusting piston 28 along the length direction of the shunt main pipe 12 can change the length of the liquid that can flow into the shunt main pipe 12, thereby changing the number of shunt branch pipes 13 connected to the drainage pipe 11, and then the number of shunt branch pipes 13 that finally flow out of the liquid sample can be adjusted, and it can be adjusted according to needs when it is filled in two, three or four test tubes.

[0052] Brief description of working process:

[0053] 1. First, put the diversion-type flow guider for groundwater sampling that can accurately adjust the flow rate into the water body to be sampled. Under the action of the counterweight block 31, the pipe body 1 sinks into the water and makes the water body submerge the sampling port. The water enters the filter installation cylinder 29 from the sampling port, and then enters the pipe body 1 after being filtered by the filter 35;

[0054] 2. After sampling for a period of time, the sampling tube is taken out from the water body through the connecting rope 32;

[0055] 3. Adjust the position of the regulating piston 28 according to the number of sample water portions as needed. For example, if three samples need to be separated at the same time, push the regulating piston 28 to between the first and second branch pipes 13 close to the regulating piston 28, and insert the branch pipe 13 into the test tube;

[0056] 4. Then, keep the speed regulating valve 17 in the state that the connecting hose 16 is closed, insert the drainage tube 11 into the sample outlet tube 7, and insert the drainage tube 11 to a suitable depth according to the scale 26 and the required sample amount;

[0057] 5. Then, open the speed regulating valve 17, and the flow rate can be fine-tuned through the speed regulating valve 17, or the connecting hose 16 can be closed.

[0058] Embodiment 2:

[0059] refer to Figure 6 and Figure 5The present invention discloses a flow diversion guide device for groundwater sampling that can accurately adjust the flow rate. The difference between the embodiment 1 is that: a guide cone 39 is provided at one end of the sample outlet tube 7 away from the drainage tube 11, and an anti-drop rod 41 is welded at one end of the guide cone 39 away from the sample outlet tube 7. The anti-drop rod 41 is arranged along the radial direction of the sample outlet tube 7; an opening and closing valve ball 40 is placed in the guide cone 39, and the anti-drop rod 41 can prevent the opening and closing valve ball 40 from falling out of the guide cone 39; a filter screen 52 is arranged in the drainage tube 11. An abutment rod 42 is welded at one end of the drainage tube 11 extending into the sample outlet tube 7, and the abutment rod 42 is arranged along the radial direction of the drainage tube 11. When the drainage tube 11 is deeply inserted into the sample outlet tube 7, the abutment rod 42 contacts the opening and closing valve ball 40, which can prevent the opening and closing valve ball 40 from blocking the drainage tube 11; the drainage tube 11 is continued to be inserted, so that the drainage tube 11 is connected with the sample outlet tube 7.

[0060] refer to Figure 6 and Figure 8 The connecting hose 16 is provided with a shutoff valve 43, which includes a valve housing 44 and a shutoff plate 45. The valve housing 44 is a "mouth"-shaped housing, and the connecting hose 16 is arranged through the valve housing 44; the shutoff plate 45 is slidably matched with the valve housing 44, and a guide through hole is provided on the valve housing 44. A pressing plate 47 is integrally formed on the shutoff plate 45, and the pressing plate 47 is "U"-shaped. The pressing plate 47 passes through the guide through hole and extends to the outside of the valve housing 44; a shutoff spring 46 is provided between the shutoff plate 45 and the inner wall of the valve housing 44, and the shutoff spring 46 is used to push the shutoff plate 45 to slide in the direction of the connecting hose 16. By pressing the pressing plate 47, the shutoff plate 45 can be pushed to slide in the direction away from the connecting hose 16, so that the connecting hose 16 is separated from the extrusion of the shutoff plate 45, so that the connecting hose 16 is connected.

[0061] refer to Fig. 9 and Fig.10 The main branch pipe 12 is connected to four branch pipes 13, which are arranged side by side. A clamping assembly 48 is provided between two adjacent branch pipes 13. The clamping assembly 48 includes a connecting strip 49, a clamping groove 50 provided on the connecting strip 49, and a clamping strip 51 clamped in the clamping groove 50. The clamping strip 51 is bonded to the branch pipe 13, and the connecting strip 49 is bonded to the side wall of the branch pipe 13 adjacent to the clamping strip 51.

[0062] The embodiments of this specific implementation method are all preferred embodiments of the present invention, and are not intended to limit the protection scope of the present invention. Therefore, any equivalent changes made based on the structure, shape, and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A flow diversion guide device for groundwater sampling capable of accurately adjusting flow velocity, comprising a pipe body (1), a sampling port arranged above the pipe body (1) and a sample outlet arranged below the pipe body (1), wherein a counterweight block (31) is arranged near the lower end of the pipe body (1), and the characteristics are: The sample outlet is provided with a sample outlet valve (4) and a flow diversion component (5); The sample outlet valve (4) comprises a valve cylinder (6) detachably connected to the tube body (1), a sample outlet tube (7) for outlet samples, and an opening and closing member for closing the sample outlet tube (7), wherein the sample outlet tube (7) is arranged to penetrate the valve cylinder (6); The flow splitting assembly (5) comprises a drainage tube (11) connected to the sample outlet tube (7), a flow splitting main tube (12) connected to the drainage tube (11), and a plurality of flow splitting branch tubes (13) connected to the flow splitting main tube (12); A sealing rubber sleeve (14) is provided inside the sample outlet tube (7), and the outer wall of the drainage tube (11) abuts against the inner wall of the sealing rubber sleeve (14); The outer side wall of the drainage tube (11) is provided with a scale (26); The opening and closing member is a valve plate (8), the valve plate (8) is slidably arranged along the axial direction of the sample outlet tube (7), a guide sleeve (9) is arranged on the valve plate (8), the outer wall of the guide sleeve (9) is arranged in close contact with the inner wall of the sample outlet tube (7), a plurality of liquid outlet holes (10) are opened on the circumferential side wall of the guide sleeve (9), and the drainage tube (11) is in contact with one end of the guide sleeve (9) away from the valve plate (8); A connecting hose (16) is provided between the drainage pipe (11) and the main flow branch pipe (12), and a speed regulating valve (17) is provided on the connecting hose (16); the speed regulating valve (17) comprises a mounting shell (21), a pipe passage for the connecting hose (16) to pass through is provided in the mounting shell (21), a rolling groove (22) is provided on the mounting shell (21), and the length direction of the rolling groove (22) is inclined relative to the length direction of the pipe passage; a rolling shaft (23) is rollingly provided in the rolling groove (22), a rolling wheel (24) is provided on the rolling shaft (23), and the circumferential surface of the rolling wheel (24) is in contact with the connecting hose (16); an indicating scale (38) is provided on the mounting shell (21); At least two guide rings (18) are provided in the valve cylinder (6), the axes of the guide rings (18) are arranged parallel to the axes of the valve cylinder (6), and the guide rings (18) are fixedly connected to the valve cylinder (6); a guide column (20) which is slidably matched with the guide rings (18) is provided on the valve plate (8), and a reset spring (36) is sleeved on the guide column (20); one end of the reset spring (36) is connected to the guide ring (18), and the end of the reset spring (36) away from the guide ring (18) is connected to the guide column (20).

2. According to claim 1, a flow diversion guide device for accurately adjusting flow rate for groundwater sampling is characterized by: The connecting hose (16) is provided with a shutoff valve (43), the shutoff valve (43) comprising a valve housing (44), the connecting hose (16) passing through the valve housing (44), the valve housing (44) being provided with a shutoff plate (45) slidably arranged along the radial direction of the connecting hose (16), a shutoff spring (46) being provided between the shutoff plate (45) and the inner wall of the valve housing (44), the shutoff spring (46) pushing the shutoff plate (45) to slide in the direction of the connecting hose (16); the shutoff plate (45) is connected with a pressing plate (47) extending out of the valve housing (44).

3. The flow diversion device for accurately adjusting flow velocity used in groundwater sampling according to claim 1, characterized in that: The flow dividing main pipe (12) is provided with an adjusting piston (28) which is slidably arranged along the length direction thereof.

4. The flow diversion guide device for accurately adjusting flow rate for groundwater sampling according to claim 1, characterized in that: A filter screen installation cylinder (29) is provided at the sampling port. The filter screen installation cylinder (29) is detachably connected to the pipe body (1), and a filter screen (35) is provided in the filter screen installation cylinder (29).

5. The flow diversion guide device for accurately adjusting flow velocity for groundwater sampling according to claim 4, characterized in that: The filter screen installation cylinder (29) is provided with a limiting wing plate (30) extending outwards.

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